Relating the structure of dark matter halos to their assembly and environment

Abstract

We use a large $N$-body simulation to study the relation of the structural properties of dark matter halos to their assembly history and environment. The complexity of individual halo assembly histories can be well described by a small number of principal components (PCs), which, compared to formation times, provide a more complete description of halo assembly histories and have a stronger correlation with halo structural properties. Using decision trees built with the random ensemble method, we find that about $60\%$, $10\%$, and $20\%$ of the variances in halo concentration, axis ratio, and spin, respectively, can be explained by combining four dominating predictors: the first PC of the assembly history, halo mass, and two environment parameters. Halo concentration is dominated by halo assembly. The local environment is found to be important for the axis ratio and spin but is degenerate with halo assembly. The small percentages of the variance in the axis ratio and spin that are explained by known assembly and environmental factors suggest that the variance is produced by many nuanced factors and should be modeled as such. The relations between halo intrinsic properties and environment are weak compared to their variances, with the anisotropy of the local tidal field having the strongest correlation with halo properties. Our method of dimension reduction and regression can help simplify the characterization of the halo population and clarify the degeneracy among halo properties.

arXiv comment22 pages, 11 figures, 2 tables. ApJ accepted. Comments are welcomed

References in corpus (78)

• A Universal Density Profile from Hierarchical Clustering
• The cosmological simulation code GADGET-2
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Baryonic Features in the Matter Transfer Function
• Ellipsoidal collapse and an improved model for the number and spatial distribution of dark matter haloes
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• An analytic model for the spatial clustering of dark matter haloes
• UniverseMachine: The Correlation between Galaxy Growth and Dark Matter Halo Assembly from z=0-10
• Concentrations of Dark Halos from their Assembly Histories
• A universal angular momentum profile for galactic halos
• The Halo Occupation Distribution: Towards an Empirical Determination of the Relation Between Galaxies and Mass
• Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations
• How do galaxies populate Dark Matter halos?
• Concentration, Spin and Shape of Dark Matter Haloes as a Function of the Cosmological Model: WMAP1, WMAP3 and WMAP5 results
• The age dependence of halo clustering
• Constraining Galaxy Formation and Cosmology with the Conditional Luminosity Function of Galaxies
• Linking halo mass to galaxy luminosity
• The Dependence of Halo Clustering on Halo Formation History, Concentration, and Occupation
• Concentration, Spin and Shape of Dark Matter Haloes: Scatter and the Dependence on Mass and Environment
• Properties of Dark Matter Haloes in Clusters, Filaments, Sheets and Voids
• Accurate universal models for the mass accretion histories and concentrations of dark matter halos
• The spin and shape of dark matter haloes in the Millennium simulation of a LambdaCDM universe
• Spatial correlation function and pairwise velocity dispersion of galaxies: CDM models versus the Las Campanas Survey
• EMERGE - An empirical model for the formation of galaxies since $z\sim 10$
• The Growth and Structure of Dark Matter Haloes
• Assembly bias in the clustering of dark matter haloes
• The Mass-Concentration-Redshift Relation of Cold and Warm Dark Matter Halos
• The Universal Mass Accretion History of CDM Haloes
• Generating Dark Matter Halo Merger Trees
• The density profile of equilibrium and non-equilibrium dark matter halos
• The Mass-Concentration-Redshift Relation of Cold Dark Matter Halos
• Halo Assembly Bias in Hierarchical Structure Formation
• Linking Early and Late Type Galaxies to their Dark Matter Haloes
• The Excursion Set Theory of Halo Mass Functions, Halo Clustering, and Halo Growth
• Mass and Redshift Dependence of Dark Halo Structure
• Dark Matter Halo Profiles of Massive Clusters: Theory vs. Observations
• Mass Accretion Rates and Histories of Dark Matter Haloes
• The Mass Profile and Accretion History of Cold Dark Matter Halos
• The Dark Side of Galaxy Color
• The dependence of dark halo clustering on the formation epoch and the concentration parameter
• On Halo Formation Times and Assembly Bias
• Density profiles of LCDM clusters
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field III: Constrained Simulation in the SDSS Volume
• Are galactic star formation and quenching governed by local, global or environmental phenomena?
• The accretion history of dark matter halos I: The physical origin of the universal function
• On the origin of cold dark matter halo density profiles
• Beyond Assembly Bias: Exploring Secondary Halo Biases for Cluster-size Haloes
• Assembly bias and the dynamical structure of dark matter halos
• The Structure and Clustering of Lyman Break Galaxies
• Environmental Dependence of Cold Dark Matter Halo Formation
• Internal properties and environments of dark matter halos
• Modelling galaxy clustering: halo occupation distribution versus subhalo matching
• Disentangling galaxy environment and host halo mass
• The Dynamical State and Mass-Concentration Relation of Galaxy Clusters
• Spatial Clustering of Dark Matter Halos: Secondary Bias, Neighbor Bias, and the Influence of Massive Neighbors on Halo Properties
• Environmental dependence in the ellipsoidal collapse model
• Cosmic web anisotropy is the primary indicator of halo assembly bias
• The distribution of ejected subhalos and its implication for halo assembly bias
• An Empirical Model for the Star Formation History in Dark Matter Halos
• Large-scale assembly bias of dark matter halos
• Machine learning cosmological structure formation
• The correlation structure of dark matter halo properties
• The multidimensional dependence of halo bias in the eye of a machine: a tale of halo structure, assembly and environment
• Star formation rates and stellar masses from machine learning
• What Do Dark Matter Properties Tell Us About Their Mass Assembly Histories?
• An interpretable machine learning framework for dark matter halo formation
• Why does the clustering of haloes depend on their formation history
• The Conditional Colour-Magnitude Distribution: I. A Comprehensive Model of the Colour-Magnitude-Halo Mass Distribution of Present-Day Galaxies
• ELUCID. VI: Cosmic variance of galaxy distribution in the local Universe
• Galaxy And Mass Assembly: Automatic Morphological Classification of Galaxies Using Statistical Learning
• The Fundamental Relation between Halo Mass and Galaxy Group Properties
• Predicting the Neutral Hydrogen Content of Galaxies From Optical Data Using Machine Learning
• The impact of filamentary accretion of subhaloes on the shape and orientation of haloes
• Characterising the Structure of Halo Merger Trees Using a Single Parameter: The Tree Entropy
• The MeSsI (Merging Systems Identification) Algorithm & Catalogue
• Approximations to galaxy star formation rate histories: properties and uses of two examples
• Characterizing simulated galaxy stellar mass histories
• Bimodal Formation Time Distribution for Infall Dark Matter Halos

Cited by in corpus (26)

• Caught in the cosmic web: Environmental effect on halo concentrations, shape, and spin
• Correlations between Triaxial Shapes and Formation History of Dark Matter Haloes
• Gas distribution from clusters to filaments in IllustrisTNG
• Does Concentration Drive the Scatter in the Stellar-to-Halo Mass Relation of Galaxy Clusters?
• On the accretion history of galaxy clusters: temporal and spatial distribution
• Connections between galaxy properties and halo formation time in the cosmic web
• Culminating the peak CUSP to descry the dark side of halos
• Late-formed halos prefer to host quiescent central galaxies. I. Observational results
• MAHGIC: A Model Adapter for the Halo-Galaxy Inter-Connection
• How to empirically model star formation in dark matter halos: I. Inferences about central galaxies from numerical simulations
• Machine learning technique for morphological classification of galaxies from the SDSS. III. Image-based inference of detailed features
• Machine learning technique for morphological classification of galaxies from SDSS. II. The image-based morphological catalogs of galaxies at 0.02<z<0.1
• Accurate Analytic Mass-Scale Relations for Dark Matter Haloes of all Masses and Redshifts
• An efficient and robust method to estimate halo concentration
• MultiCAM: A multivariable framework for connecting the mass accretion history of haloes with their properties
• Testing the Reliability of Fast Methods for Weak Lensing Simulations: WL-MOKA on PINOCCHIO
• Unexpected clustering pattern in dwarf galaxies challenges formation models
• Characterizing the assembly of dark matter halos with protohalo size histories: I. Redshift evolution, relation to descendant halos, and halo assembly bias
• Evaluating the origins of the secondary bias based on the correlation of halo properties with the linear density field
• Applying unsupervised learning to resolve evolutionary histories and explore the galaxy-halo connection in IllustrisTNG
• Shape and connectivity of groups and clusters: Impact of dynamical state and accretion history
• Caught in the cosmic web: environmental effects on subhalo abundance and internal density profiles
• A Conditional Abundance Matching Method of Extending Simulated Halo Merger Trees to Resolve Low-Mass Progenitors and Sub-halos
• Halo cluster shapes: Insights from simulated galaxies and ICL with prospects for weak lensing applications
• Testing a New Star Formation History Model from Principal Component Analysis to Facilitate Spectral Synthesis Modeling
• Predicting Halo Formation Time Using Machine Learning